What wavelengths are you interested in?

Ideally, 650-900 nm.

Tissue optical properties have been studied a lot, but most on human. I think you should be able to use their values. The biological diversity will likely be larger than the difference between human muscles . What do you need it for, designing a instrument yourself?

The paper "Near-infrared optical properties of ex vivo human skin and subcutaneous tissues measured using the Monte Carlo inversion technique." should be relevant.

Kind regards

Otto

Otto,

Thanks for the reference. I've attempted to collect references that deal with optical properties of porcine muscle tissues in order to compare with our own measurements. The request for the community feedback was in case I've missed something (which is almost always a case!) or anybody could provide some recent data.

Serge,

Are you thinking of in vivo or ex vivo porcine muscle? Draining the microvasculature of blood will change the absorption. If you just want a quick measurement of a pork chop, I (and many others) could probably help, but live pigs are tougher.

Also, my recollection is that the largest variation in practical in vivo muscle measurements is the thicknes of the overlying skin/fat layer- pay close attention to the depth sensitivity of your measurement.

Guoqiang Yu, now at U Kentucky, has published a number of papers on in vivo muscle measurements (human).

r/

David

David,

Thanks for the offer! We were doing ex vivo measurements on porcine phantoms prepared from pork loin that we purchased at a local butcher shop. Since we used bulk tissues (several cm thick) and performed spectrally resolved measurements using a novel algorithm, I wanted to compare our data with published ones. All I could find were 4-5 publications where single-wavelength values of mua and mus' were reported. No spectral data unfortunately. I remember seeing spectrally resolved data for some human and bovine muscles but I was mainly interested in porcine samples. So, I referenced them in a manuscript which is currently under review. Indeed, in vivo measurements would and should paint a different picture because of a different hemoglobin oxygenation and tissue saturation levels in addition to the aspect mentioned by you. If you interested, I can send you the paper once it's published.

This publication contains our recent data on optical absorption and scattering properties of bulk porcine muscles, Longissimus dorsi (the loin) and Psoas major (the tenderloin):

https://www.researchgate.net/publication/261693250_Optical_absorption_and_scattering_properties_of_bulk_porcine_muscle_phantoms_from_interstitial_radiance_measurements_in_650900_nm_range?ev=prf_pub

Article Optical absorption and scattering properties of bulk porcine...